﻿#region MIT License

// Yamster!
// Copyright (c) Microsoft Corporation
// All rights reserved. 
// 
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
// associated documentation files (the ""Software""), to deal in the Software without restriction, 
// including without limitation the rights to use, copy, modify, merge, publish, distribute, 
// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or 
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#endregion

using System.Linq;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using Yamster.Core;

namespace Yamster.Core.SQLite
{
    public class SQLiteMappedColumnSet : FreezableObject
    {
        List<MappedColumn> columns = new List<MappedColumn>();
        MappedColumn primaryKeyColumn = null;

        public SQLiteMappedColumnSet()
        {
            
        }

        public IList<MappedColumn> Columns
        {
            get
            {
                if (base.IsFrozen)
                    return new ReadOnlyCollection<MappedColumn>(columns);
                else
                    return columns;
            }
        }

        public MappedColumn PrimaryKeyColumn
        {
            get
            {
                if (primaryKeyColumn == null || !this.IsFrozen)
                {
                    primaryKeyColumn = this.Columns.FirstOrDefault(x => x.PrimaryKey);
                }
                return primaryKeyColumn;
            }
        }


        protected override void OnFreezing()
        {
            if (IsFrozen)
                return;

            base.OnFreezing();
            foreach (var column in columns)
                column.Freeze();

            // Clear the cache
            primaryKeyColumn = null;
        }

    }
}
